Characterization of Cement-Fiber-Treated Reclaimed Asphalt Pavement Aggregates: Preliminary Investigation

Hoyos, Laureano R.; Puppala, Anand J.; Ordonez, Carlos A.

doi:10.1061/(asce)mt.1943-5533.0000267

Cited by 167 publications

(48 citation statements)

References 14 publications

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“…Portland Cement Association (PCA) has suggested that the UCS of 7-day-cured chemically stabilized base course materials should be in the range of 2070 to 2760 kPa [14]. Guthrie et al [14], Taha et al [23], Ganne [12], Yuan et al [35], and Hoyos et al [17] evaluated the UCS of 7-day-cured cement-stabilized blends of RAP and aggregates commonly used for base course applications. All the above researchers, except Guthrie et al [14] and Ganne [12] found [14] found that the virgin aggregate samples had lower UCS than the blends containing 25 and 50 % RAP.…”

Section: Unconfined Compressive Strengthmentioning

confidence: 99%

Recent Development of Recycled Asphalt Pavement (RAP) Bases Treated for Roadway Applications

Thakur

Han

2015

Transp. Infrastruct. Geotech.

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Recycled asphalt pavement (RAP) has increasingly been used as a base material for highway construction as a sustainable solution. Due to the existence of asphalt, 100 % RAP typically has low strength and high potential of creep and permanent deformations. RAP can be blended with virgin aggregate, stabilized by cement and fly ash, or confined by geocell to increase its strength and reduce its creep and permanent deformations. This paper examines several recent experimental studies on treated RAP bases (blended RAP aggregate, cement and fly ash-stabilized RAP, and geocell-confined RAP) and discusses the key findings from these studies including the proportion of RAP to virgin aggregate, type and percent of stabilizing agent, strength, modulus, and creep deformation of treated RAP under static loading, and permanent deformation of treated RAP under cyclic loading.

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Section: Unconfined Compressive Strengthmentioning

confidence: 99%

Recent Development of Recycled Asphalt Pavement (RAP) Bases Treated for Roadway Applications

Thakur

Han

2015

Transp. Infrastruct. Geotech.

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“…RAP contains asphalt binder (3-7%) and aggregates (93-97%) by weight (Han & Thakur, 2015), and is an ideal recycled waste material for reuse in pavement applications. RAP often exhibits low strength and stiffness performances, hence chemical stabilization of RAP is used extensively for developing bound pavement base/sub-base material (Hoyos et al, 2011;Saride et al, 2015). Several researchers have reported that the performance of cement stabilized RAP satisfied the requirements of pavement base/subbase application (Hoyos.…”

Section: Introductionmentioning

confidence: 99%

Wetting and Drying Characteristics of Recycled Asphalt Pavement-Fly Ash Blend as a Sustainable Pavement Material

Hoy¹,

Horpibulsuk²,

Rachan³

et al. 2017

dtmse

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ABSTRACT:The usage of Recycled Asphalt Pavement (RAP) and Fly Ash (FA) blend in pavement applications contributes to the sustainable usage of such waste by-products. Although RAP-FA blend has been proven as a pavement material based on strength and leachate requirement, the durability of this blend when exposed to an aggressive environment has not been investigated to date. This research presents the effect of wetting-drying (w-d) cycles on the strength and microstructural changes of RAP-FA blend. The strength characteristic of this material was determined by Unconfined Compression Strength (UCS) test. The mineralogical and microstructural changes of the compound pavement material were also analyzed using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Test results show that the UCS of RAP-FA blend increases with increasing the number of w-d cycles (C), reaching its peak at 6 w-d cycles. The XRD and SEM analyses indicate that the increased UCS of RAP-FA blend is due to stimulation of the chemical reaction between the high amount of Calcium in RAP and the high amount of Silica and Alumina in FA during w-d cycles leading to production of more Calcium Silicate Hydrate (C-S-H) and Calcium Aluminate Hydrate (C-A-H). For C > 6, the significant macro-cracks due to the loss of moisture content during drying stage cause strength reduction. However, its reduced UCS is still greater than the minimum strength requirement even at C = 20. The outcome from this research confirms the viability of using RAP-FA blends as an alternative sustainable pavement material.

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“…However, the natural soils mixed with RAP exhibit low strength and collapse on wetting. These limitations have led to the new research efforts aimed at exploring novel stabilization methods to treat soil-RAP mixture before their use in pavement base or subbase construction [6]. The cost-effective method for stabilizing pavement material is a cold in-place mixed with cement.…”

Section: Introductionmentioning

confidence: 99%

“…Laboratory and field investigation on the use of RAP material in pavement base and subbase applications has been conducted by Rutgers University [14]. Other research works on the use of RAP have been reported in the most recent literature (e.g., [6], [15] to [17]). However, there are no methodologies based on rational criteria to assess the target strength for practical use; the conventional technique to design the mixed proportions of soil/RAP mixture is based on a trial batch.…”

Section: Introductionmentioning

confidence: 99%

Strength Assessment of Cement Treated Soil-Reclaimed Asphalt Pavement (Rap) Mixture

Suebsuk¹

2014

geomate

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ABSTRACT:The article attempts to present the influence of reclaimed asphalt pavement (RAP) content on the compaction behavior and unconfined compressive strength of cement treated soil-RAP mixture. The laboratory compaction and unconfined compression tests on cement treated soil-RAP mixture were carried out with various RAP and cement contents. The porosity was adopted as a state parameter for assessing the strength of the mixed materials. The results show that with an increase in RAP content, the OMC tends to decrease, up to the optimum of soil/RAP ratio of 50/50. The asphalt fixation point is designated as a transitional point where a small change in strength turns to a larger change. An asphalt content of 3.5% (50/50 soil/RAP ratio) is found to be the asphalt fixation point. The strengths, where the asphalt content is lower than the asphalt fixation point, can be predicted by the proposed generalized form of strength. This proposed equation can assess the laboratory strength of cement treated soil-RAP mixture under various mixed proportions, cement contents, water contents, and curing times.

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Characterization of Cement-Fiber-Treated Reclaimed Asphalt Pavement Aggregates: Preliminary Investigation

Cited by 167 publications

References 14 publications

Recent Development of Recycled Asphalt Pavement (RAP) Bases Treated for Roadway Applications

Recent Development of Recycled Asphalt Pavement (RAP) Bases Treated for Roadway Applications

Wetting and Drying Characteristics of Recycled Asphalt Pavement-Fly Ash Blend as a Sustainable Pavement Material

Strength Assessment of Cement Treated Soil-Reclaimed Asphalt Pavement (Rap) Mixture

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